11816557 has 2 divisors, whose sum is σ = 11816558. Its totient is φ = 11816556.

The previous prime is 11816551. The next prime is 11816573. The reversal of 11816557 is 75561811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10883401 + 933156 = 3299^2 + 966^2 .

It is a cyclic number.

It is not a de Polignac number, because 11816557 - 2¹⁹ = 11292269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11816551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5908278 + 5908279.

It is an arithmetic number, because the mean of its divisors is an integer number (5908279).

Almost surely, 2^11816557 is an apocalyptic number.

It is an amenable number.

11816557 is a deficient number, since it is larger than the sum of its proper divisors (1).

11816557 is an equidigital number, since it uses as much as digits as its factorization.

11816557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8400, while the sum is 34.

The square root of 11816557 is about 3437.5219272028. The cubic root of 11816557 is about 227.7702427983.

The spelling of 11816557 in words is "eleven million, eight hundred sixteen thousand, five hundred fifty-seven".